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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = '1802ddabec6e852aee9d2963ab7e50e1aa73e0ec65378c9452d37fce9dca808a' 
  AND token = 'PzyvEPkOgwtB5nFkl1JL6+cfPVvdBDM9wS6/MRY8eJg=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00059

JSON explain

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