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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e5875a8badfb736cf560cac22bcdd31534b2a807c521c77bd77b09171ffb074e' 
  AND token = 'MRLTCYdGFj1DYP6KtJB1PEJK1+DhUQ4tfTpwIlTsy7I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00038

JSON explain

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