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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'a0c03450cefa137d9bbe6170465a7a4e0c9cba3afc65b9cc429b4ad4b21545c9' 
  AND token = '+wEawH0WwKPlWEqDZaHA+mXfdpK4Rzketns49m7IdDs=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00019

JSON explain

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