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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '812cdc5bcd9d84321a18179e46262424471e4258fef4da7a51dff02b906604e5' 
  AND token = '29UlKLApXR7oIW2iBAaq7oOMw4IxjjZoh9N2ELAKigw=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00039

JSON explain

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