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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '4afa36feb85e66b49b3455066cde8b0ef409b9ed3932fc25a8c90ddc640f6772' 
  AND token = '7A2No0OCWJ+PIHY4dnKoJqIddPR/X6mVX6vFIoxSs+I=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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