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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'd0c66d71114cb3b38e8745e8a5bc71284f812d06cd79f79fadc3e6b7ef0a941f' 
  AND token = '2ikDqavHZvJaNlB6NePsvzoZtSpoccccR68vprmIc1Y=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00034

JSON explain

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