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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'fd4373b3db6909439cfe04aa3efe08c09ea2d5a9a559869c52a2fce3ee46cdc7' 
  AND token = 'QnKXA5xvsOrND4IlLYwZfEWmQsu4IQnBdailEQujTZY=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00031

JSON explain

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