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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'c63c1ae63b5df1609e8c7dcc4183bfdd6cb573d0bdcc733aabb09cae720e01a0' 
  AND token = 'Sr87O1Aj6Eawbi8DldYUQOnWC2eq81oD/6dBKAUzo30=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00030

JSON explain

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