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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd124a2932a42941f2ca77027e52fc324fe1ae7ec5590da2a2806515898768b97' 
  AND token = '6FQUlCk8Luq4YvDYySTpcctwqVt9vayYNsS81SFRip8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00015

JSON explain

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