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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '184b20546bd0bbf0212034e02095a9f75b2a78c34127e567c6d7ca212550feac' 
  AND token = 'F0DDrNwLxd77wgbTkG0o22KrnvxbuU+KfB/rB6KmULo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00022

JSON explain

{
  "query_block": {
    "select_id": 1,
    "message": "no matching row in const table"
  }
}