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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '34c3d6b09b7d25ec382c4859653623d0b22ec5b5dd6e8bba7c99a16f6d06bf44' 
  AND token = 'yXMf4FzXn1cMKZv4RuXSaen+mAR8WAPPDBzsGJzfQUA=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00020

JSON explain

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