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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bcae985ae2eebfd5c59ee66efb7bc2d1c5b881cee7955294ddb139fcda3fb12f' 
  AND token = '4/5K5exs1wNxw0Jz76UACaYPvZjC0mjj2bbclGE2Pe4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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