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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'bac7b8259f7bf55ba4d03c37e6c2971cd5ef73c71b4627101e578db68bf76cd5' 
  AND token = '6fTeePxL3rqsdu2WtfGH/RFKGOZMnznLtjExMg6NVl8=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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