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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd750ea81602e90d0154755e05696e3620b21591bade66d3b2e66e445c51e1135' 
  AND token = '98XQXM3MwVp1+A7adIQIrVCi/NOivLcGMCkVmbfP70A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00043

JSON explain

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