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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '0ea609370e968e0a1550b6099979d998682b6c5b4add42254f07cfb301f768a8' 
  AND token = 'dscWRubdDhHXgNkpR/NSPXvHyikwq4mFK1dirJX7t0U=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00053

JSON explain

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