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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '313247504ab78898fcd76d4b0e3b14fea28ab2f14b919a7ff7157b1c11abb60c' 
  AND token = 'TqZxl6w7vsEjDRrCxtbt0SHGKxaDj15nbvvhzvY+l5I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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