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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3b4f936b2d153f5930fc728199b1474166700fe40ad3f5e8c38945f64ee51bf7' 
  AND token = 'IEyWxGS4VY80PDWPktMaR+fS8gh55uGtcUe1J6pYpVI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00029

JSON explain

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