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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ae544c95426be27397230acbd521fa0932e3076d61314ea116f063133fdccc33' 
  AND token = 'KWLb0n5grNEUF9WUF+sHrbL56f8IVxnrZ/uX2cR5rl0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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