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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '082c09ba7bc1ba8b36edcf983b620e2c4ce1a0dbf43f89e4ce83a2e310568539' 
  AND token = '6f8TTJd1rNXK7Z5lZ028zx5cvnkMN4D2LtzmpG0gvWw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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