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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'f697014c902cf2bb980d47b7615b9fe0ba8f9bc80e743c969c8f8648ed485317' 
  AND token = 'MIvXyEYiLtPwyIRM0aTOj3QF1pUn9aIeQBE2haC/+Oo=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00016

JSON explain

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