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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b58ba707d13116b43dd323d7caad813f1e8681e114f5d8a0e3c7b0f8902831b3' 
  AND token = 'tqK8WbX0oNEtu94z/bU/Ll1VySEUfMWeP5EMRHQnFy8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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