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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'e8eb3ca4cc1d698b91a331a3325d4574af5de98ec2a2b27a09a0ff99c0215f04' 
  AND token = 'izt8tNtztFpow17visZg82MkHI9HTZjyfP5zsINWiaI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00040

JSON explain

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