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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '13151a94b4081897e28b8cb48fc656c568a9fdd8968c71b63d70511061b1e7c5' 
  AND token = 'CBgrzHmz8x/SKe56xqouwY5KcZTppViSXW7MevWtfO8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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