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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '6f087c3cda7fbc5133b299f983550a1abb9ea57850d0adeccab1882963a2a41d' 
  AND token = 'jLpZq1hrSq09tcyZy/mozuERZRBZc0EFOjspF5G1P1w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00028

JSON explain

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