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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '43fba6ed40cfb46f13c2bdf4e8ba6df6c7cf8cee7de2f418d353bec9a9fc973a' 
  AND token = 'v9pbAMv1ZFcz7atk4BH6f5uL3QdL/P/yh1jVUmmiE0A=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00044

JSON explain

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