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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '39ad117c89f7c06c553b3e5c2d8ec112782d453db8034912d7de8fb7f9b19e1a' 
  AND token = 'iv/uTvDS+jOmuMn2F5vtdvmGn9PBx7TxAorRQd6Maos=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00025

JSON explain

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