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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c02bc4029eb57098e961928f58ec0b810408da9b810f6193c5d4570e1fada037' 
  AND token = 'X9+q8Ki1PC/tBd+sLuj95Rk8koODJjIPK0Ii+Cm6OQA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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