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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c41637a91283682767be5448f78392af516a0c38565b4014e1e51d2ea7c1a4cc' 
  AND token = 'XozxrvMChTgIAAf5owTiFIyRaax6keE7RK94m0g9zPM=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00017

JSON explain

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