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SELECT 
  1 
FROM 
  cscart_lock_keys 
WHERE 
  key_id = 'cf7d8ccad462e3cf15cd59edddb8fe2e8176dfcbfa1eef79d85ca450bf73e1a1' 
  AND token = 'jvupyNu0iIFbs5TSuM4BBLJamQYl2H+3kVt7oN60Ku0=' 
  AND expiry_at > UNIX_TIMESTAMP(NOW())

Query time 0.00036

JSON explain

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