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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '3ca9ca8af278ff53444646c26c6c9ff3e92f58df86d86bbfd2b7fd765cc452ed' 
  AND token = 'PtwoAoWSEMk0Re5lUhdtNwl0xaBeRQlQne5kvMRh5Zw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00024

JSON explain

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