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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c92dc2e12ab0006f6b880f38a3a6830b415024f390e085b134a88308343033ae' 
  AND token = '2tFmgwbBV2fluLg7iEipoZAI2f+s/gntUHnz2tf5wW8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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