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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '50631dd4866378167f03ac0ca601df2e01223d0b3d6ccbefd2986747a9840ed9' 
  AND token = 'xGgwGkYTtNZcqaV04Nt/uLSLW+FTLiWPgbLn54CczBE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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