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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0047a29bb48ef4d8fd65e3a00bdb18b74445f5cd5ae523687b1243af2911e2f2' 
  AND token = 'OcKWffbhvgMLKxmNxqzLsRlQI1cMhmKDDLwrPWhOSLU=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00018

JSON explain

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