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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'df05bc2550cb05c7f86bdb7749b23e347f614c908fb2e0b4b5016eb1e1622c5a' 
  AND token = '01SVr0pxiKPHVC5VoIUc2ZN/OVhL7/wfYQovYIM4yJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00056

JSON explain

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