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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'b8dd72346053ef718cac3eb543c7ea451bfa8fa4f99cbc72958ff25c98d9ccf2' 
  AND token = 'wX1LUQJkK8qiGkOnGwax5MHwyeUn6z18Eppk+4swTBk=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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