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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '33adf7484853631c50c3ba2de70d0b6aa1ec4ab8ff69709ff4d5e9b8fa84b376' 
  AND token = 'N0RrtTn8bvEtb0ufiOAC5DZDnz7LKofbs+sCqdeny44=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00037

JSON explain

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