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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '61ba1ae76369b5d18eef2c24bc9087c5472383191a5357e5664e5372da52c2a2' 
  AND token = 'tgH7bfH3aw47A5tyYaLUOB/8bh7ibPS6RWDV2oypw1s=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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