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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0318b90dfd0ed96fe5490715ed7ca757b3bc0d31dd4c318a6049d514376600c2' 
  AND token = '/BXaAD/gw6LT83G/7glCBYvmtBNyFGvXYDDg+V2t81M=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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