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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '67d47eaeef0e56428922870aa7d265dc9f3036eb297eeb1e89a9b4c6485eafb8' 
  AND token = '/Sg3iJwBJitlwteQUkYMox00MKUWMo3gRGigncRx778=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00033

JSON explain

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