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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1240e5b1e6ca268b4a2538767d89c90c0d31f66fbb962a8ebd909b596a52a562' 
  AND token = 'bW1/pA+I6Yq9ZpkJXkSOqa3TF93AcEddQW4He1gFDwY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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