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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fc6b5d3369726103d4a8bf6840c02aaab17458b08556acb7650588da05245ceb' 
  AND token = 'WMs8u8EsnjrP/thSKcBZSb/snKUWu/G2N0SwY7vK70w=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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