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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'ccc8aa63d69913f420b3e3d51dca1f6f2f97eef26797d6326132bb4e62fd9c89' 
  AND token = 'o8NmkyN6ER83+x+a80SOP17bqpxUOpkRM03EPDvsv1k=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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