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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '7ffd830d84c6a4cad42cfce79cd7af4edd62b58aab03cc93ecbfed6d4c84874a' 
  AND token = 'BaRpAikJ9U6YWnevw2HUcbiInrhr6az6d5kXc3eA2C0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00045

JSON explain

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