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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9c00c2b412314bb79e28065ae8d623ec38029f06ab73aa7e1f2135e646134a1c' 
  AND token = 'dijQdJdV7XibNnayD0cn5nihk8TjaGqTYsSzTHD6bnk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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