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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b7a8dcaa05296f8690ef20a2e6578b8bfe44412493dbdd892c8ffe6df9954292' 
  AND token = '4iw2oVGfStqEI2ipg+zumkg+8HQU164alHxXZiqD+Xo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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