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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '31b83ea4401a7af33f2aef8b21137fe44dca53d58aeee9707130c0e3bf951407' 
  AND token = 'D+eSdfCJGFzt3n/AquHx/45okZVvoLHy+3AfmTGo1oQ=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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