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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c23c291ecd5e3610f14ab1ea68c874fd7f87095a61f60ac571df7ac6d1b56c41' 
  AND token = 'nT9OQ4sB9o5256KKLBHPCcrKbUCQYzLofH/b8sagCjc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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