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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8e61eb53f0b94401e7c9d19cf572d2c09f121faedf851da318913e129b1d1e2' 
  AND token = '8gWAPWH9zWLdM3vdPvrAYeyh8IqpKA+RgT6h/KPQHVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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