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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '74e557d409cab4ff02e7dd8e409ecd90b4d1746122e96800526c7906d87d82ab' 
  AND token = '2YgU5rYiwgv/GjHn+1K6iN7dZYhLokY+4Nj0cGivJkE=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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