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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c83b3feb7366f05ce70a4410da239c1fd77d4280a60839f0727653acd54dd6b5' 
  AND token = 'DM9dnhSld7SLbxSMB2YkkDhm5X/ikQKZ5Cqtpp4xjb8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00058

JSON explain

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