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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4196844583f2e03adc380f3466d5a600c318b4dafce924ecb035bb4d7c41e897' 
  AND token = 'y+firftD29BY+Yf+pCTsT6N2fprgl8VOulmjaJ7k7UE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00021

JSON explain

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