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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '530fddb2903d0920a204c7e06c29f0bc4b33f387abe512579f4422750833bc20' 
  AND token = 'keEw65440uJh4lNxMHJ3j92YUSX6EXRUy1atJl0x+zc=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00032

JSON explain

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