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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '9ff29dff6e5ad39de9bf086b9ab9eeeec4b5242c0e0452b1008ce69877815a33' 
  AND token = 'lGp8e4JcainuXhUt7ONYu3yxufFoES0s2ymtJJjnjf4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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