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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '58d5231981f4831610d4a4d1c3211dc6e58a748d756a01f9cc276b226149f0e8' 
  AND token = '5Ht/FsYoZmffDzNvJg2N1I4rrqWnGnO8XPlr0Ei69EI=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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