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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '44b0bae6204929892833589cd2b9105b8258bd60758361de320c01e99f59ee6e' 
  AND token = 'IX3fdoNirTnf4RCGygGEBfCQkpCScZTo+2zGyrnx4rs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00026

JSON explain

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