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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c0c483c12e2b0ce7cb9893aee19be58c5a69cc3e986a795f246334e98ed90e89' 
  AND token = 'aS9z/w+2Yf+WdUjYniIjQDj1l5wRFP+oszktHR71nG8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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