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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '94c88fdf00eac848444cba939b9f47b7478330a102078634db5da3fc905a2c98' 
  AND token = '3SqBwblbP6aW7o3HBp//Er1AJDcoiBVlLAhqQSMLdHQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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