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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '91fc84801a5f37cd59578e1acf27ed0276d9f101aa1e49209e6220c0959dee0f' 
  AND token = 'DyklPBXhdtrjq1yS5ZbU5MA19dqaC/tx4uy6bbotanw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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