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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '89a5c33cb0602c63172f6b0f2151df8e39123ae530b61114a33b067bbdc681ea' 
  AND token = 'AnxsIU3dItSpxqD1JSDC2lRhU4oAdQ5Ksz7B2agniF4=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00042

JSON explain

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