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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '36192d6d98583c734c81956056a9efced3c0491b59aa6a4ab2ad88f2b4cf458e' 
  AND token = 'Eb3gKIRDbNlH7MGNGi51IvbmBuCKSWM/plocrdfsc7c=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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