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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd03664c7992b7b2eefa13c0f0c497f8928a92d1150e2205b8401302469eb0be' 
  AND token = 'y95gDDjAUzGrFjWU73HDEhdcE63vn3E+NDVcVCPH4xk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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