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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9eba56f2b1c488c42ac5ba258d0f5c1687abc2f496db0cb301f9e88bf7aec876' 
  AND token = 'vefLJ4NWb494F67rTZX4g4nakBupAFdBlxujcfhR4EY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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