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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4a879eed3ededcda1ba95244b477e5e45e59bdd6bbfa1086125e222a5a7cb505' 
  AND token = '55qPWgQkHEzxywVNUP0wwZTP71Fy6J7jJZSHLz15waE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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