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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1eb5a0eece2f8a0bb4b106393ecc31f968c871102a12b8cf823a057879b91f2e' 
  AND token = 'QBXRC1GHUztpiJD9UcVdvWwIibQdc5BIrQCU6KbZx7o=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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